One of the challenges we run into when balancing for Pro play is ensuring that the changes we make don't have an overly negative impact on other levels of play. We’re okay with this because it’s expected that some champs are better for some audiences than others. Amumu is an example of a champion who typically excels in Average play but doesn’t really show up in Pro play. This means that absence from Pro play on its own doesn’t guarantee we'll buff a champion (though we may still choose to, if we can avoid making them OP elsewhere). ![]() The Champion Balance Framework only recommends we buff a champion when they are underpowered at all levels of play. We think this target represents a healthy meta where multiple strategies are viable and multiple champions can fill a variety of roles in those strategies. ![]() For Pro play, our current target is for 45% of champions to have 5%+ presence. In addition to the Balance Framework's targets, we’ve also set meta diversity targets for each segment of play. Regular Season Champion Diversity Targets We’ve set it at 5% to ensure presence is not just a one-time player or champion pocket pick, but something that can be viable in multiple games. We use 5% presence as our identifier for underpowered champions at the professional level. This ensures that there isn’t a small group of borderline-OP champions sitting at the top of the meta for too long. The second layer looks at presence over two consecutive patches with a lowered threshold of 85% (80% for MSI/Worlds). This ensures that any spikes in champion power due to a recent buff are quickly dealt with. Any champion that hits a presence of 95% (90% for MSI/Worlds) or higher in one patch will receive a nerf. We use two layers to identify overpowered champions in Pro play. At most, we see around 200 pro matches on a single patch, which is barely a whisper of a fraction of a percent of the amount of data we need to feel confident balancing around win rate. Win rate is less valuable here because the sample size on any given patch makes it a less reliable measure of power. In professional play, we focus on presence-which is the aggregate of picks and bans-as a measure of power instead of win rate. The top four regions are determined by current Worlds seeding rules, which are a reflection of each region’s international performance (success at MSI/Worlds) over recent years. You’ll notice that we primarily focus on the top four regions for professional play (LCK, LPL, LEC, LCS), even though there are 12 regional leagues globally. Outside of patches that major tournaments like MSI and Worlds will be played on, the Champion Balance Framework governs our approach to Pro play balance. This time, we're talking about how we balance Summoner’s Rift for the highest level of League: Pro play. Blog 4, early September: Balancing runes and items (with a few callouts for preseason 2021).Blog 3, mid August: Balancing for Pro play and major tournaments like Worlds. ![]()
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